Malicious PDF — malware analysis report

Static analysis result for SHA-256 735b13210495f4e2…

MALICIOUS

PDF

95.5 KB Created: 2021-08-07 21:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e4d5843ce9b49123d8f9d5bd168004e4 SHA-1: 97e5e5fdd2de35b7dbebfb7618c0acd08468a866 SHA-256: 735b13210495f4e2e49eaef65cae80e2c38d530f75cd158df9481a5f88d0767d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chcial.ru/uplcv?utm_term=what+is+the+best+anti+spy+detector PDF link annotation
    • http://ashioke.com/images/library/File/vujemuriwepefukow.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/sidataxujesoz.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/gejapivuxi.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb7eab07781---dubidek.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a582fd2c19fcfd196967cf300bc3162d/raxemevaxavipopibiz.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/keripawujujepolomafofix.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/3cf8fc33448b7a84066c8c9ad60e45f1/34096460849.pdfIn PDF document text
    • http://veivel.com/userfiles/file/98472910302.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/wuguligumadasexapo.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/piliref.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/02723b7692d0265860b0c74a6fa064f8/95899389983.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/kiwemasasilumazotavedon.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/mexoribut.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/71095774345.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/tofisusokisukokewogasi.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e24f2c18b2---kobobukiponene.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ab07dqfjqcun8q1b2a4b16k4f0/pipodomupo.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/bakulijutefotudu.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/nikupizaxotojobekefek.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a71ba2d92d---8767488923.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/t1s8lel7srpiv64706e0g3b1ta/46263623277.pdfIn PDF document text
    • https://shopabrang.com/images/files/90490922851.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/33398188079.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/766193802609634f135a85.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/jurisamimatumulina.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001112b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12942 10812 bytes
SHA-256: ff3266c54c370dde7c0978985bfcc3f46fc05f7329a7bdd0a530a245c47da068
font_02_sfnt_off000141ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141EF 17144 bytes
SHA-256: 4a25fe77e53ebf0f54a551f219b0fd8614aea2427a76cdd85ee87192a59b51b5

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